This is a long article and there's more content of each side's brief. Mosby is claiming immunity from civil suits. I see her atty, an Assistant AG is throwing in the "bright-line rule". The officers' lawyers were successful in the trials, hoping the same will happen in this case.

A federal appellate court has put on hold a lawsuit against Baltimore State's Attorney Marilyn Mosby brought by five of the officers charged in the arrest and death of Freddie Gray, pending the outcome of her appeal of the case.

The officers sued Mosby in April 2016 for malicious prosecution, and a federal district judge had ordered that discovery and depositions should go forward as Mosby appealed the suit.

On Friday the 4th U.S. Circuit Court of Appeals ordered a stay of the district court proceedings until Mosby's appeal has been decided.

Mosby, who is being represented by the Maryland attorney general's Office, is arguing that as a prosecutor she has immunity from civil claims. Her attorneys said she has a "strong likelihood of success on appeal" and shouldn't have to go through the discovery process.

"The public ... has a substantial interest in having Ms. Mosby's immunity assertions resolved as efficiently, expeditiously, and fairly as possible, which is served by her unfettered presentation of those defenses to the appellate court," Assistant Attorney General Karl A. Pothier wrote in a March motion. [...]Garbis said Mosby does not enjoy immunity in the case because her office acted as independent investigators and not simply prosecutors.

Mosby's opening brief to the appellate court judges is due June 13, with a response from the officers' attorneys due July 13. The court said a reply to that response could be filed 14 days after the response brief is submitted.

Pothier wrote that while Mosby said at a May 1, 2015, news conference that her office had conducted an independent investigation, the officers' claims relate to her evaluation of evidence and not any investigative work.

US Justice Department Won't Charge Baltimore Police OfficersBy Associated Press | The New York Times | September 12, 2017

BALTIMORE — The U.S. Department of Justice said Tuesday it won't bring federal civil rights charges against six Baltimore police officers involved in the arrest and in-custody death of Freddie Gray, a young black man whose death touched off weeks of protests and unrest in the city.[...]The Justice Department said in a statement that while Gray's death was "undeniably tragic," federal prosecutors did not find enough evidence to prove the officers willfully violated his civil rights, a high legal threshold.[...]Five officers face internal disciplinary hearings scheduled to begin Oct. 30. Those officers are Lt. Brian Rice, Sgt. Alicia White and officers Caesar Goodson, Edward Nero and Garrett Miller. The sixth officer, William Porter, was not charged administratively.

A Baltimore police officer who was acquitted of criminal charges in the death of a suspect while in custody is now fighting an administrative procedure that could cost him his job.

Officer Caesar Goodson is facing a police disciplinary board hearing over the death of Freddie Gray, who sustained fatal spinal cord injuries while being transported in a police van in April 2015. Goodson was the driver of the van.

Attorney Neil Duke, who is representing the Baltimore Police Department, said on the first day of the hearing that Goodson should be fired after failing in his duty by not fastening the 25-year-old Gray in his seatbelt after he was arrested. Duke also said Goodson failed to interact with Gray and did not take him to a hospital, as Gray had requested.

The case, Duke said, boils down to whether Goodson followed police policies.

"The evidence will show that he did not," Duke told a three-member disciplinary board in opening statements Monday.[...] The hearing is expected to last about five days. The board is made up of two members of the Baltimore Police Department and a chairman who is a member of a police department other than Baltimore's. The board will ultimately decide whether the officer should be disciplined and what the punishment would be.

Six officers were charged in Gray's death. Goodson had faced the most serious charge — murder. Goodson, Officer Edward Nero and Lt. Brian Rice were acquitted at trial last year. After the acquittals, prosecutors dropped the charges against the remaining three officers, Sgt. Alicia White, and officers Garrett Miller and William Porter.

Nero and Miller recently accepted disciplinary action, according to the police union attorney who represents them. Neither their attorney nor the department would say what kind of discipline they faced.

BALTIMORE (WJZ/AP) — A police disciplinary board has heard closing arguments in a probe of the highest ranking Baltimore officer involved in the 2015 arrest of a 25-year-old black man who died from injuries he sustained in a police van.

Attorneys gave their closing arguments Thursday. It wasn’t immediately clear when the three-member panel will issue a ruling.

Lt. Rice is one of three officers to face firing, and the second to go to administrative trial.

The panel found Officer Caesar Goodson not guilty of 21 charges last week. Goodson was the van driver.

A lawyer for Baltimore's top prosecutor asked a federal appeals court Wednesday to dismiss a lawsuit by five police officers who claim she maliciously prosecuted them in the death of a black man gravely injured in police custody.

Assistant Attorney General Karl Pothier told the three-judge panel that as a prosecutor, Marilyn Mosby has immunity from the lawsuit filed by officers who were charged but later cleared in the arrest and death of Freddie Gray. Pothier urged the 4th U.S. Circuit Court of Appeals to overturn a judge's decision to allow parts of the lawsuit to go to trial.

The court did not indicate when it would rule.[...]On Wednesday, Judge J. Harvie Wilkinson III grilled the officers' lawyers about why they should be allowed to sue Mosby for bringing criminal charges against them and holding a news conference to announce the charges.

“What we're talking about here is muzzling prosecutors who have publicly expressed grounds for prosecuting police officers,” said Wilkinson, who repeatedly raised his voice while questioning the officers' lawyers.

The officers also claim that Mosby prosecuted them to ease public unrest after Gray's death.